What Is The Correct Syntax Of A Floating Static Route?
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What is the correct syntax of a floating static route?
Answer: The floating static route is for the backup of the routes mostly to the routes which are learned from the dynamic routing protocol. For the configuration of the floating static route, the router must have a high administrative distance rather than the primary route, such as for the primary route which is learned through OSPF, then route which gives the backup to the OSPF route must have the administrative distance higher than the 110. the distance of administrative on the floating static route is placed at the end of the static route: ip route 209.165.200.228 255.255.255.248 10.0.0.1 120.
Floating static route and its configuration
In case of the failure of the link, the floating static route is used by the network administrator which gives the backup to the primary static or the dynamic route and works only in case of the absence of the primary route. The causes of the failure are due to physical layer problems or maybe wrong configuration. If many routes are presented to the destination then the path with the low administrative distance is preferable by the router.
The administrative distance by default of the EIGRP is 90, in case someone wants to configure the floating static route of the EIGRP routes. The configuration of the floating is only possible if the administrative value is greater than 90, and if the configuration happens below the value 90 then the router uses the static route first.
Configuration of floating static route
In the global configuration, the floating static route happens by using the ‘ip route’ command. If the distance is not specified then the default value is 1. for example suppose in a topology the default static route is configured with the default distance value and referring to the fastest Ethernet 0/0 of router 3. the configuration of the floating route happens with the following commands in the global configuration:
Verification of the floating static route
Router 3 by default refer to router 2 along with the default administrative distance and the floating static route by default refer to router 1 with the value of 3. so the administrative value is higher than the default value which is 1, so this route will float and not available in the routing table unless the pointing route fails. The command “show ip route” is used.
The verification of the route can also happen with the “tracert and traceroute” command. Another way for the verification is by disconnecting the cable of router 1 and router 3 and checking the routing table of router 3.